Security researchers with iDefense have identified vulnerabilities that could cause heap-based overflows in several of the Flac codec’s components. To exploit the security holes an attacker would need to send a carefully crafted audio file to the user. If successful, the attacker would be able to execute arbitrary code and thus compromise the machine.

The bug, which is rated as moderately critical by security reviewers Secunia, affects all systems and applications that use the free codec. An update for Flac to version 1.2.1 resolves the issue. Binaries and source code packages are available from the project website, and software vendors are already starting to update their applications.